If you don't stand as a way of saying that this country needs change, I say go for it. If you don't stand because you want to be a social media star and a general jackass then I say move on with your life.
I took a stand back in high school because a teacher told me I HAD to stand for the pledge of allegiance, and in my mind that's NOT the freedom we as Americans enjoy, so naturally the next day I didn't stand. It turned into this BIG deal with letters being sent to parents and then lawsuits from other students' parents etc etc...end of the day I won and it was a new policy to not have to stand, but damn did I stand every single time after that because Freedom! lol.
You want your red-blooded American flag covered heart to boil with patriotism? look up the video of the Marine carrying an American flag and being called out by some young dirty self-entitled pricks wearing sickle and hammer shirts. The one kid said he hoped the marine dies and that jihadists were the same as civilians and we don't need to be killing them. One of those videos were you know it wont happen but you fantasize exactly how'd you spend your time in jail after you beat that punk ass kid with a chair and strangled him with his communist tank top.