That.is.a.good.one!

Considering there are 4.25 Chinese for each American I would say they are much more normal than we are even when driving their bikes very slow during war times

Chinese people aren't normal?
I blame autocorrect.
You may all go to hell, and I will go to Texas.

Slow Peds is clearly a reference to the well know fact that Chinese people in the 1920's rode their bikes much slower than normal people. It was like they were all on holiday even when they were at war. Quite remarkable really!

Not to split hairs, but "slopeheads" was a reference to the supposed shape of their heads, not to their eyes.

"Derogatory term "slopes" used in Nam"
"Slopes" wasn't very commonly used in Vietnam; the term "g o o k s" was the common name applied to Vietnam Cong (and NVA).
"even if not particularly derogatory like "Charlie" for Vietnamese soldiers."
"Charlie" (short for "Victor Charlie", radio phonetic alphabet for VC - Viet Cong - not Vietnamese soldiers, North or South) wasn't derogatory at all; it was akin to referring to German soldiers as "Jerry" in WWII.

Nickm2 hit that right on the nose. Derogatory term "slopes" used in Nam, etc. there is always a term used in these combat situations even if not particularly derogatory like "Charlie" for Vietnamese soldiers.

It's was in pretty common usage in the 1950s-70s; we used it to refer to Koreans and Vietnamesealong with the more common term beep sometimes it was shortened to just 'slopes'; I guess you can say it has gone out of fashion
nm

I believe Clint Eastwood's character uses the term in Gran Torino as well.

After turning on the commentary on my blu-ray disc, I discovered "slopehead" was the term used toward the Chinese people.
Well, that is certainly new to me. I have never heard of "slopehead" used to describe Asians before. This must be an older term that has fallen out of fashion. There are plenty of other derogatory comments used against Asians now.

They were calling the Chinese "slopeheads." That is a derogatory racial epithet for Asian people with slanted eyes.
Pray for an early spring or permission to open fire.