Woah, chill...
One might think I just insulted your whole bloodline, sheesh.
True to an extend, though "lags" as an excuse gets thrown around so casually whenever something goes wrong and even for issues that have nothing to do with connection. And just for the record, poor hardware can, at the very least, contribute to lags or cause freezes. Different issue but the result is the same for the player: they see and react to mechanics later than others - usually too late.
Whatever it is that keeps you from performing decently doesn't matter. Wether it's lags, hardware, hamster on your keyboard, finger in your nose... it doesn't matter. If you are, for whatever reason, not able to perform decently enough for the content you're tackling, you shouldn't go in there. Knowing about issues and still going into raids without informing others of the issues and asking if they're cool with it is asshole behaviour.
If you can play the mechanics correctly with lags, good on you and welcome to the team. Care to remind me where exactly I said that you can't join even if you CAN play every mechanic correctly?
But if you can't play decently then your fun and enjoying the game isn't more important than that of 7 other people. And I'd like to see you convince me otherwise.
And I love how you try to twist it around so it makes me look like an egoistic elitist who would exclude you out of pure spite when it's a simple fact that many boss mechanics require precise positioning and timing and messing them up doesn't just kill you but probably the rest of the raid aswell.
This isn't about what I think you should do. This is about the content requiring a certain reaction time and gameplay to successfully complete. And "B-b-buut... my pc/ connection is bad! I can't help it Q.Q" isn't going to change that. The boss doesn't care about why someone couldn't make it in time. The result for the raid remains the same. If it's not a recurring thing, no worries.
But I had plenty of people in my parties who only cared to mention that they're playing on a potatoe pc after several wipes they caused by not being able to move their butt in time. THIS is egoistic. Not expecting decent hardware/ connection OR the ability to deal with it accordingly and decent gameplay.