In my experience, it totally depends on the shop and what kind if environment the owners are trying to cultivate. I’ve been to super competitive shops that are crazy anal about sticking to game rules, rude to newcomers, etc, and I’ve been to others (like my current shop) that realize we’re a bunch of middle aged fucks playing with toys (40k is my shit).

More often than not, though, the vibe is going to be a welcoming one. As others have said, its more people to play games with! Especially in the plastic crack community, where there’s certainly a 30 year Warhammer veteran just waiting for a newbie to dump their lore knowledge into.