Professor kicked me out of the honors program, I sent him an email a year later.
blog.politify.com
blog.politify.com
But seriously, gloating is not considered good form. Showing off how effectively you gloated is even worse form.
If you had exited for several tens of millions, or build a hundred million long-term company, that might have been something to instill some jealousy on the professor, but would still be nothing to counter an academic judgement.