The electoral college is the way it is because the smaller states would never have joined the union at all without some protection from being ignored in the political process, something that still happens to a large extent.

And you don't really understand the 3/5ths compromise.

His point is that the 3/5th compromise doesn't count people equally, like today where all votes aren't equal.

It didn't count them equally because they weren't allowed to vote. Let's say you had a state with one voter and 9,999,999 people who couldn't vote. Should that guy have the voting power of ten million people?

That guy shouldn't. But do you realize that this flaw exists in today's presidential election system?

If in the entire state of California, only 1 voter casts his ballot and the millions of other don't vote or can't vote, then this single ballot would decide all 55 electoral votes of California.

That's true. The difference is on a percentage basis the people who can't vote today are a tiny percentage of the population. In the antebellum South that wasn't the case.