Besides how it might offend Thawntex's delicate soundguy sensibilities, it's bad business. If you're a local opener band, you have a finite number of fans to begin with...and that fan base is usually at least initially comprised of your friends. You should be working on your entire persona...i.e. your fans are your fans and you should appear as a rock god to them. Not saying be a douchey diva, not at all...but when you have a significant portion of your fan base loading you in, hanging out by the stage, you aren't special...you're just their buddy.If you can't pull off acting as large as Gene Simmons to your friends who bought a ticket to come see you, you will never be able to convince a stranger that you are a rock god. Hence, from the moment you leave the house to the moment you return, you should be a performer, and everyone else is either club staff or fans. Load your own shit. Treat the club staff great, because they are your co-workers for the night. Perform as if you are headliner, and act accordingly. Shout out the bands before and after you...plug the headliner hard. Sell merch, sign autographs, then go to the afterparty at your guitar player's house and THEN you can be friends with your friends.
The stage is for performers.