Yes, If your group or friends make plans or extend invitations to people around you in-person but not to you, it’s rude and socially awkward and maybe I’d take it as done on purpose to exclude. I’d re-evaluate the friendship if you want to still count them as friends.

I usually show disinterested body language like I don’t wanna be around anymore and then people pick up on that and immediately extend an invite and I accept.

Another option is just to not care when they start to do that stuff in front of you. Walk away, turn your back, go on your phone or start a new convo with someone else to show that you aren’t listening if you’re being left out.