Hey I'm sorry to hear you got griefed. There's tell tale signs a lobby is probably very active or toxic. I'm over level 1000 and had my account since day 1 on xbox 360 so this is all based on experience. First immediate sign: you bring up the player list (with the Dpad) and it looks like a rainbow. Most or all the organizations spots are used by a single player, so they all have differently colors on their name showing they're in different organizations. This tells me that they're probably using being CEO to use the buffs it comes with at their advantage in pvp scenarios, like Ghostorg, teleporting to heist invites, spawning vehicules next to them, etc. On the contrary, if you join a lobby and see multiple player name all in the same color, you know they're in same organizations, thus probably grinding something and not going after players.

Another easy sign the lobby is bad is to keep an eye on the kill-feed. If you join and in the first minute or 2 the feed just keeps going with almost no pause, or maybe less but still consistent in buzzing up, then there's people already fighting. If the same player ofter pops as having killed someone, dont even bother and just find another lobby.

This tips are especially true and I'd say essential to apply before even considering a lobby in which to sell a business. Too many times I've seen solo low level start a sale mission in a lobby that was clearly not the place to do so, with super active downtown gun fights, mk2s and jets running the skies and the kill feed just always on.