Back in the day when we used to go and try stuff all the time, I'd first always pick up a bass ( and occasionally a Git just for a lark) and have a strum on it not plugged in, loads of times you can just go "Nah.." to yourself at that stage, as it immediately doesn't appeal by the feel of it.
Obviously if it passes the 'pick it up and twang it a bit' test, you can then ask them to steer you towards an amp and see what it sounds like.
Funnily enough despite the fact we always looked like scumbags I don't ever recall being refused to try anything in a music shop. Maybe they didn't want to risk it in case we'd just signed a record deal or something 🤣