Why are people so angry about people starting with the parts they want

I am reading part 7 as my into to jojos cause I have heard its the best and I actually really like westerns, but I am also know about what happens in the other parts and that its an alternate universe. I dont have the time or frankly dont want to start reading everything in sequential order, so I am starting with part 7. But that dosent mean I dont appreciate or understand other parts, I am equally interested in those too and if I had more interest I would read any other parts. SO why is many parts of the community calling other people larpers and gatekeeping the media, this is an anthology series, every part is connected but narratively different pieces of medias. People could genuinely love and appreciate the series while starting from the part they are intrested