In a theory course in grad school, 1981.
Other student: In a capitalist society, scientific fact are produced like products of the capitalist economy.
Other student: racist science about IQ...
Me: [shuts down].
I could not go on and point out that this was a total misdirection. Of course, racist science is deplorable, but it has nothing to do with "capitalism" to the way science is actually done. The example given had nothing to do with the assertion. I learned then that I could not debate with people like that.