Calling people transphobic is another example of leftist gaslighting. 

A phobia is an irrational fear. By using this label they're telling people that their very legitimate concerns are irrational. In a sense they're calling you crazy, which is the very definition of gaslighting. 

Fathers of daughters have very legitimate concerns about letting demented cross-dressing men into their daughters safe spaces. 

Female athletes have very legitimate concerns of fairness in being required to compete against men. 

Parents of young children have legitimate concerns about public school teachers normalizing this cross-gender degeneracy to their children. 

If you share these concerns, you're not being irrational, and don't let them tell you otherwise.