I always found people who take pictures with the middle finger as a trashy gesture. I don’t and never know who they’re trying to tell off but it’s out of no where and just stupid. It doesn’t offend me, I just find it a pointless gesture and therefore - trashy.
Similarly, speaking at full volume on your phone in public.
And the phone is on speaker! Motherfucker, you can hear it better when it’s not on speaker and is pressed against your ear!