[Closed] people who have a firm hand shake

To be clear, I don't mean any type of euphemism.

I know someone socially and whenever we greet each other or say goodbye he offers out his hand so I do the same. He then appears to squeeze as much as he can without it showing on his face. Not even a firm handshake. A blooming hard squeeze. The thing I don't understand is, he is not so strong that he is incapable of using his hands gently, I've seen him manage perfectly well holding a wine glass and even blowing his nose without breaking anything. Isn't it all a bit old school to try and show your strength this way?