I don't understand that complaint, honestly...
I don't know. Seems to me the bug could have been found if it was well placed enough that it served any kind of use. We've no idea what kind of "bug" it was, how big it was, how it worked, or anything like that but we
do know that it was placed in his VISOR and that it transmitted a visual signal to the Klingon ship.
Hell, you'd think at the very least the Enterprise would have detected the
signal from the thing! It just strikes me as odd that the bug wasn't detected in some fashion it's not like the VISOR has a lot of hiding places to stick things.
Furthermore I find it odd that one of the first things that happens to Geordi after he gets back on the ship from being
kidnapped for some period of time and subjected to some form of torture that necessitated his trip[ to sickbay and for Crusher to say "... I removed the nanoprobe and I think you're going to be fine," is he goes... Back to work? I mean he can't at least get a day off to recover from what he just went through? The Crusher I know wouldn't stand for Geordi just going right back to work and would have made him take some rest before going for a shower and then back to work.
Well when it comes down to it, I couldn't really give a rat's ass about TNG representing diversity in humanity through Geordi and his disability.
Then you've missed the entire point of Star Trek.
Apparently other 24th century people thought the VISOR didn't look normal.
From time to time in other episodes, some people made a big deal about Geordi being blind and having to use a VISOR.
Well, that 24th Century "person" who thought Geordi's VISOR looked abnormal was a madman blowing up stars in order for him to live in a fantasy la-la-la land. He may have also been trying to "get Geordi's goat" a little bit. The only other people who made a big-deal about Geordi's VISOR where people who simply had not been exposed to the technology before. I can think of three episodes where Geordi's VISOR was called out by a guest on the ship:
1. Loud as a Whisper: A visiting dispute negotiator who is deaf and uses a "chorus" of people to read his thoughts and express them notes Geordi's VISOR. I really like this encounter as Geordi and Reva -the guest- sort of "bond" over their shared disability and how they've worked around it in some fashion. (The VISOR, effectively, doing for Geordi what the chorus did for Reva.)
2. The Enemy: While trapped on a planet Geordi encounters, and bonds with, a Romulan also trapped on the planet. The Romulan expresses some shock that Geordi's parents "allowed him to live" given his disability. The Romulan further points out that one of the reasons why humans are weak is because we waste resources on trying to help people who are disabled. The VISOR (along with a tricorder) plays a key role in helping get the two off of the planet. (The implication being that the Romulans are "lesser" than humans because it was because of Geordi's being "allowed to live" that it was possible for there to be more avenues of technology leading to saving the Romulan's life.)
3. The Masterpiece Society: The Enterprise encounters a society of genetically perfect people, their colony is at risk from being damaged by a passing stellar core fragment. One of the colonists says that someone like Geordi -someone with a disability- wouldn't be possible in their society as his genetic defect would have been weeded out or removed before he was born. (It's not clear if it would have simply been corrected or if Geordi wouldn't have been allowed to be born.) The technology behind Geordi's VISOR ends up playing a role in saving the colony. (Again, implying that "genetically perfect" people aren't a good idea as it'd curb development of technology that likely serve a role in helping the greater whole.)
But, for the most part, people seemed non-reactionary to Geordi and his VISOR.
Hell, I'd make solid arguments that it would have been nice to see one or two more VISORs either on background characters or guest characters somewhere else in Trek to suggest it was a common tool for vision correction for the blind.