If you do raid prog but refuse to do M+ then you are being carried. If you are just raid logging and putting no effort into improving your character then you are literally a burden on your group.
I think of it like this - It's a team sport and you refuse to turn up for practice each week before we play because you think you are better than everyone else even though you are overweight and never score.
What does everyone else think? We have a few people like this in my guild and it really pisses me off. It probably shouldn't but it honestly makes me feel like giving up when some of us are throwing everything we have at a boss whilst others may as well be afk. I know, find another guild. I just do not understand people like this and how little shame they must have.