I guess you're trying to characterize laws that happen to apply to a particular subset of population that you'll label a "minority" and characterize them as "discrimination" hence equal them with laws that are really discriminating.
The point you're missing is that those other laws are against behaviors that we find bad for society. We don't have laws that discriminate against drug users as a group (e.g. disallowing drug users to enter restaurants), we just have laws that penalize drug use and distribution. Our laws don't discriminate smokers but penalize smoking.
Denying marriage to gays discriminates against gays. It doesn't penalize a behavior.
Gays are not denied marriage - there is nothing stopping gays from marrying opposite sex partners.
It's true that opposite sex marriage is given a privileged position, and this benefits people who want to engage in it. It's also true that purchasing a home is given a privileged position, and this benefits people who want to buy a home with a mortgage.
Thus, denying subsidies to renters (unless they go against their preferences) is discrimination against people who prefer to rent, just as denying marriage to gays (unless they go against their preferences) is discrimination against gays.
The point you're missing is that those other laws are against behaviors that we find bad for society. We don't have laws that discriminate against drug users as a group (e.g. disallowing drug users to enter restaurants), we just have laws that penalize drug use and distribution. Our laws don't discriminate smokers but penalize smoking.
Denying marriage to gays discriminates against gays. It doesn't penalize a behavior.
This is not a subtle distinction.