Man-splaining (rant)

One thing I'm tired of having man-splained to me as a service desk worker is "the clear caulk comes out white" I have explained countless times that it takes up to two weeks to cure clear. Only to be told I'm wrong despite it saying so on the tube. To then recommend they just try a different brand then because I guarantee the next bottle will also be white only for them to go back and get the new one and admit that after talking to someone in wall coverings it appears I was right. One man even said "I talked to a guy back there who said everything you said, I'm surprised you knew as much as him". As if it's not extremely insulting that you trusted him over me just because he was a man. But oh well, I'll survive.