I understand you are new to the hobby, and new to this forum, so you will not know either who we, on this forum, are, nor the wide range of asshats that play this game like most of us here already know about.
So, my advice may come a bit too harsh, but, grow a pair of nuts dude.
You ran into two neck beards whose lack of sex, due to their large size, makes their crappy armies the focus of their libido and pathetic lives. Don't be a puss and let the actions of two strangers deter you from branching out.
Get out there, meet new people, and have fun!
You are just too new, green, and at that new store you were also too, um, naive. You automatically assume that strangers you meet automatically have more pull, more strength, more clout, in this hobby than you do. This is not true! You just need to man up your tiny nuts a bit and tell those neck beards to get on your lap, and get over your paint job.
Far too often in this hobby I witness bullies, but even more so, I witness people who allow more veteran players to step all over them. Just like any bully you meet in High School, you never turn the other cheek. You get in his neck beard face and tell him, "If you don't like my paint job, then get your crappy wolves off the table you fat neck beard."
Painting is NOT a requirement to play. I have armies from over 20 years ago, still unpainted, because even though I am a video game illustrator, I am not a painter. I prefer to play the game, not paint the figures.
Please, do not judge ALL hobbyists in 40k based on those two jerkwads.