How To Boot Someone Offline Roblox
Full Answer
Booting is very illegal and unethical and if it happens to an Xbox user it is advised that they must unplug the router and leave it off for a few days. Most importantly, a user must file a complaint to the local police station regarding the same and then call your ISP and request a new IP address.
You can't DDoS from roblox alone. Perm ban this person and their alts on sight, ignore it or pay them off.
Although the Roblox website does not disclose it, you can do so by using an IP grabber that has already been made or adding the script of an IP grabber to your server.
You shouldn't worry about people getting your IP through Roblox since it's pretty much impossible, they'd have to get all the connections that are connected to that server (which they can't), then they have to identify who's who through the connection which again, they can't.