Handshake error

Josh and I shook hands the other day. I told him a man needs a firm handshake. He was unconvinced.
The next day Josh was going in for an interview for a better department with his current employer. Apropos of our handshaking conversation, I mentioned he should shake the interviewer's hand with a firm grip. I said when I shake someone's hand and it feels like a dead fish, I always notice and think they are lily-livered. Josh was still unconvinced. Or simply unconcerned perhaps.
Still trying to convince him that a firm handshake was important for first impressions--especially as an introduction for a job interview, I said, "Even if it doesn't matter, wouldn't it be better to have a firm rather than a limp handshake?"
Josh replied, "No one looks at me and assumes that I'm going to have a firm handshake."
"Then that's even better, they will be impressed by a good handshake," I said.
Then Josh said, "Well, I don't think the element of surprise is necessary."