Patriotism is one thing, Nationalism is another.
Being proud of where you come from / where you live is totally fine. And it's okay to show that you are proud of that.
Being proud to the point of actually believing your country is just inherently superior is another.
Although I suppose technically there are different ideas as to what Nationalism is, but regardless of that... the point is that you can be prideful of your country, but you don't have to look down on others because of it.
Patriotism is just the love/devotion of ones country. Even if it is random that you happened to be born there... so what? Does that mean you can't love where you were born? What's wrong with having pride in your birth place?
You can have pride in your country itself, even if there's a lot wrong with it. I, for one, love where I was born. I love being American, I love being a Texas, what I don't love is the city area I was born around and the couple of cities/towns I grew up in. So I don't love my city area, but I do have some pride in it because of the ****in' Arts District it has. But that's about the extent of my pride for it.
As for my country and state, hell the **** yeah I have pride for it, I love it! I love where I was born and I wouldn't change it for anything, I love it too much.
And yes I do wave flags around, it's fun to show off the pride and faith you have to the place you were born and presumably raised. If it's not your thing, that's cool, but I find it fun and refreshing to know not everyone hates my country and state even though they were born and raised here themselves.
And just because I love where I was born and raised doesn't mean I don't have complaints, but just because it's not perfect doesn't mean I'm going to hate it, it means I want what is best for it. That's all.
So, yeah, basically I'm saying there's not a **** thing wrong with it. If it's not your thing, that's cool, no one is making you participate or anything, but for other people they are just happy to be born and raised where they were and they wanna show it. Nothing wrong with that. Some people don't care one way or the other, some care too much and think they're country is superior, others outright hate the country they were born and raised in. It varies all over the place. That sorta thing tends to happen when people have different opinions on certain things.
As for me though, I obviously see nothing wrong with it. I am who I am because of where I was born and raised, among other reasons, so yeah I have pride in that. But you can be proud of where you were born and raised for any reason really, for me it's just the sheer fact that it was me where was born and raised here. It's not perfect, but it's home. So I guess to to me the fact that's random is why I have pride in it, out of all the places I could have been born, I was born here.
Although it's not really random, is it? My family all made the various choices to live here. So, yeah. It's because of them I was born here after all.