Rugerman said:
You should use it as a chance to change the way he thinks about it.
Thats what I'd have done.
Additionally I'd use it as an opportunity to segue into a newbie shooter day at my local range. Maybe invite acouple other guys from the office and/or non work related friends to keep it casual & comfortable for the anti.
I did this with my mother inlaws daughters and her brother upon my CCW activities coming up without my asking as a point of conversation last Thanksgiving. The next day I took them to the range to shoot and show them how fun the 'sport' can be not at all talking about carry. As it turned out the uncle used to shoot 30 yrs. ago when he was in college but hadn't touched a gun since. His skills had near zero rust. One of the daughters was a natural hitting the bullsye for a double tap within the first string of 10 via a .22 I'd rented for her. She now keeps one of hers targets from that session pinned above her desk at work with pride and when she's in town asks that I take her to the range. The other daughter didn't care for shooting at all nor tried too much and was content to just watch.
Since then none of the three have given me grief about being a CCW and the uncle in specific told my mother inlaw that he'd had a ton of fun and was especially impressed at my own concern for firearms safety and how well I did at instructing them in pistol basics.
It often takes small incremental steps toward converting gun fearful and/or explaining facts & figures to anti-CCW types.
I know as myself I was anti CCW inspecific for ages even as I've always been pro-gun and have been shooting since childhood.
- Janq