Patriotism, even celebrating loudly and brightly doesn't have to be mindless. Take America. I know our history has fallen quite short of perfect, but I have no problem flying the flag or celebrating the good things. Not only does that honor the good things, but it's a reminder of how we can use those positive values to fix things that aren't working right.
Well, respectfully, I'd say that the USA is not really a good example. It's a sort of poster child for mindless patriotism, to be honest. (That doesn't mean that all of it is mindless or all Americans are mindless or anything like that. I don't mean to cause offense.)
Some of that, I think, is a cultural issue--a lot of European countries seem from an American perspective to express shame towards themselves regardless of whether it's deserved or not. We do have much more outward display than Europe typically accepts, but that display should not be conflated with ignorance. If someone speaks cruelly, then they should be judged for their unkindness. But, that does not invalidate our customs just because they are different from some other nations. Not to mention the fact that because our beliefs do tend to be different, we are sometimes condemned just because of the disagreement.
Like I said, we're not saints. We have screwed up, sometimes in a big way. But just as other nations ask that we tolerate differences in values and customs, some of what we have here is just that: values and customs and is NOT automatically harmful because it's different. Tolerance and understanding, in my opinion, should flow in two directions, not just in one.