Very scary hacker

Today I was playing ROBLOX just like I do everyday but something was off

my game seemed a lot more glichy but i still played and ignored it and keep playing but then a player by the name of "iloveyouandimnice" joined my game and it said i was friends with them saying in the chat "your friend iloveyouandimnice has joined the game" i checked to see if they were my friend but they were not I did not think much of it tho thinking it was a glich so I ignored it but then about 5 minutes later the screen turned red and i was kicked then about 15 seconds later i got sent to a game called "good job kid" when i tryed to press the X button to close roblox the game went for screen and "iloveyouandimnice" joined the game at this point i was really scared then whoever it was "hi kid goodbye kid" then roblox crashed everything turned red and then my pc crashed when i reloaded my pc and checked why it crashed it said "good job kid" im still super scared at this happened maybe an hour ago and the user does exist if you do want to go to his profile here is a link https://www.roblox.com/users/492225813/profile i will never forget this event and i will never unblock that user!