Yeah you really don’t need to understand and know every character and movie in the MCU to understand Infinity War and that’s a stupid ass thing to insinuate. Like if you have any pop culture knowledge of these characters and have seen even one other movie it’s great. And it’s really not terrible for Marvel to assume that because really.. it’s been long enough. It’s not unreasonable to assume that you have passing familiarity with Marvel characters. Not even being able to name them all, I sure as hell can’t, but just knowing certain groups or heroes exist. And really, it’s not like you have to have been a fan since Marvel’s inception to follow the movie. My mom has barely seen any of the movies, and I haven’t either (or I’ve seen them and couldn’t follow them or don’t remember them)(I remember Ragnarok, Homecoming and Black Panther incredibly vaguely despite enjoying all three. They go on so long it’s hard), and we both enjoyed it. It also uses recent stuff incredibly intentionally, and the jist of the movie can be understood without massive background knowledge. Good guys, bad guy. Good guys try to stop the bad guy. Pretty simple. Plus.. movies that assume prior knowledge are allowed to exist, it’s not an attack on you personally, lol.