Alexis Bellinowon’t let Shannon Beador or her friends take her down. The Real Housewives of Orange County alum, who RadarOnline.com was told is seriously considering her Bravo comeback, took Beador’s best friend, Vicki Gunvalson, to the cleaners after the latter trashed her relationship with Shannon’s ex-boyfriend, John Janssen. While Gunvalson called Bellino’s relationship with Janssen “ridiculous and thirsty,” Alexis took issue with Vicki hawking an Instagram post that claimed she was breaking her silence on the romance. “As I promised, I am NOT HOLDING MY TONGUE in my thoughts on Alexis DAT…