I don't eat in restaurants much anymore. Part of the reason is finances (food budget is tight these days) and part of the reason is because I use a wheeled walker to get around. Restaurant staff have occasionally rolled their eyes at the thought of having to find a place where I won't be in the way, and they insist they want to take my walker away and stash it somewhere.
It doesn't seem to occur to them that taking away a mobility-disabled person's mobility device is the same as trapping them there and preventing them from leaving when they want, or even to just use the washroom. It can also cause problems if the person has an issue with balance.
As a result, I don't go many places anymore, certainly not to places where the prevailing attitude is one of ableism.
Unfortunately, I have to put up with that when I have my annual eye exam. They not only take my walker, but try to take my canes (plan B if the walker isn't within reach or the space I need to get through is too narrow when I want to reach something). I tell them no, absolutely not, you can't take them unless you're prepared to pick me up off the floor if I lose my balance and fall. Since that gets into liability issues, they haven't absolutely insisted on taking my canes; I've told them that I need at least one of my mobility devices within reach at all times.
Anyway, chairs. Sometimes I might drop into the Mcdonald's at the local mall, which is a sit-down place. I use the time for two purposes - first, for a quick snack, and secondly, it's handy to organize my shopping before getting on the bus to come home. I take disabled transit, and everything has to be packed and balanced to take up the least amount of space. There can't be any risk of anything falling over or spilling, so after it's organized, I tie everything down with a bungee cord. The clerks at Walmart have learned to just let me pack stuff my way, as I've got it pretty much down now as to what fits where.
Of course I put the chairs back - I often have to push them out of the way so I can get through the restaurant.