

I was the first in my workplace to take paternity leave when it became law in my state. I didn’t take it in one chunk, but used every single day I was entitled to. I got many similar comments as you from older guys, and I believe they came from a place of jealousy at worst and self-rationalization at best, since those people weren’t afforded the same rights when they had kids.
Pay then no attention, the first few months as a dad to a new kid are some of the most important and precious moments you’ll ever have, and if you miss them you will never ever get a do over. Take every second you can without an ounce of shame.
You may also find yourself setting an example, as I noticed none of the new Dads in my workplace after me had any reservations about taking their full leave, and I work in construction with some needlessly macho guys.
That’s not how it played out in Buffalo NY in their last mayoral election. A socialist won the primary and the Democratic party launched a massive write-in campaign to keep their preferred liberal “Byron Brown” in power, to the point they were handing out stamps at voting locations so that they could be used to easily “write” him. They succeeded in keeping the socialist candidate out, and despite winning, their liberal candidate ended up resigning mid-term to take a cushy C-suite job instead.