Maybe you should read this back and think about what you're saying here.
Jumping in with a strategy when people want to figure stuff out for themselves isn't courteous. You could have simply asked whether they wanted help, and let them answer; then if the group isn't compatible with you then accept that you're not suited to that style of play and politely decline. If 3 wipes is just too much for you, then that sounds very impatient.
Going on about being a pro player. I dunno. Like I said before, guides make a big difference to content difficulty, and can take challenging content down to being super easy. So acting like pros read guides and get it right away doesn't sound right to me.