Personally I dislike these self-brag replies. The spotlight doesn't always have to be on you, you know? This feels like your whole first paragraph is there so that the part about how great you are has a tenuous tie to being contextually appropriate. There are plenty of places to brag about how well you do, you could even make your own thread about it. Start a Youtube channel maybe. I hope you're better at SMN than you are at grammar. Honestly though if you have to put others down to feel good about yourself maybe you have bigger problems than optimizing your dps?
There is nothing wrong with being good at the game and wanting to help others improve or worrying about how others perform when it might have a direct impact on your own gameplay. I've been in similar situations and managed to offer helpful advice and encouragement without sounding like I'm only talking for the sake of spreading the news of how good I am. I do a good job on a bunch of classes, not that that's relavent to the conversation at all. But if I were unable to read a thread about someone feeling insecure without responding in a rude, condescending and demeaning way I would probably stop responding on the forums at all since most people I know are decent human beings with empathy and a conscience.
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Honestly I usually hate these sorts of replies that copy sentence-by-sentence but I think this might be the most appropriate way to highlight the rampant disrespect in this post. For real though dude, grats on those purples. If I knew all it took to be a god of like 5 classes was callous disregard for the feelings of others I would have been clearing Ultimate months ago.