Imo Rihanna avis make some users look petty af I also tend to stereotype Madonna avi'd users as rabid with a 95% chance of causing drama, especially PNG Madonna avis, definitely the messiest.
I assume if you have a high quality Gaga avi, you most likely obsessively stan and can't take any criticisms of your fave.
If someone has Ariana in their avi I usually just assume they're super friendly and sweet (which is almost always true).
Also if you have an obscure/unknown/indie artist in your avi, I assume you're a bit pretentious & maybe a bit old.