That's not excusable. Nobody is asking for everyone to be a sweet cupcake, because sometimes you do need someone to be "Dr.House" and give it to you straight, but the entire point of "Dr.House" was that he lacked bedside manner or tact, because he only took cases that were challenging. He absolutely did everything possible to avoid doing anything easy. If your patient thinks the pills you prescribe them make their pee smell funny so they stopped taking them, you want the doctor to say "You will ****ing die if you don't take those pills. That is on YOU, not ME."
Hence in a raid, if there is a wipe, identify the problem, not WHO cause the problem. Not enough DPS, ask who can do better. Can't heal through damage, ask if anyone can switch with the healer. Tank is instant-killed on a certain mechanic, switch tanks, etc. If someone you play with simply can't play any role, as apparent by always taking dirt naps as DPS, then perhaps that person needs to try a different DPS. You get absolutely nowhere by kicking people because they aren't the top 1% DPS on a third party unverifiable website.