Hell, I'm not even sure what slacks are. Dockers? The only place you used to see the words trousers, slacks and pant in the same place was the L.L. Bean catalog.
I wasn't trying to put slack wearers down. Even when I had a job, I'd change before I went to the Park. I've never played golf where you had to wear "long pants". Collared shirt is my baseline.