Start with a informal meetup, over coffee etc, meetup.com is a great way to get started on this. Once you have people interested and coming regularly then you can plan other things. Getting the intial people interested is the hardest part though and will take the longest time, but once you reach a certain point, word of mouth will take over and grow organically.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Start with a informal meetup, over coffee etc, meetup.com is a great way to get started on this. Once you have people interested and coming regularly then you can plan other things. Getting the intial people interested is the hardest part though and will take the longest time, but once you reach a certain point, word of mouth will take over and grow organically.