There's the whole issue with Martin's brother, despite Martin saying in Season 1, "I never had a brother." Serious Business: If Frasier or Niles are unhappy with something, no matter how insignificant and petty, they will go to any lengths to change it to suit their tastes.
This has caused him to gain a half-joking reputation amongst fans as a petty troll who goes out of his way to be responsible for every bad thing that has ever happened to Flash, no matter how insignificant or harmless said bad thing is.