[fwdude]

Some discrimination is more “equal” than others.

[Svartalfiar]

Section 230, in its entirety:

“No provider or user of an interactive computer service shall be treated as the publisher or speaker of any information provided by another information content provider."

What possible reading of this text says that a company is allowed (or not allowed) to discriminate against their users? Negative rights, not positive rights. You can't get in trouble for what someone else says. That has nothing to do with you preventing them from saying it.