The right wing in the US has spent a lot of money and time co-opting the flag as a signal.
So the right wing overuses flag imagery, and as a result the left starts to view the flag as problematic? That's a Democrat/liberal problem.
To not realize this to me means you either haven't been paying attention, or very much live in a bubble.
I pay attention and don't live in a bubble, and I still think it's absolutely absurd to let the overuse of your countries flag by a specific political group dictate how you feel about seeing said flag.