Possibly. You may want to consult with a local landlord tenant lawyer.
Actively practicing law in Texas. Inactive licenses in Arizona and Georgia. All answers are general in nature and no attorney/client relationship exists in this forum.
The landlord will likely argue that you have created a nuisance since the feral cats are likely to frequent the property since they've been fed there, and will likely seek to sue you for the damages caused by the cats. If you want to live there, stop feeding the cats. Your landlord has a first amendment right to be a jerk and say rude things. A lease can not predict everything so it does not say you can not feed feral cats. But that does not mean your landlord has to tolerate it. If you're on a month to month or if your lease term is up soon, he can simply decide not to renew with you. Or, he can start eviction proceedings. You should read your lease to see what it says, and a consultation with a local landlord/tenant attorney is a good idea.
We do not have an attorney-client relationship. I am not your lawyer. The statements I have made do not constitute legal advice. Any statements I have made are based upon the very limited facts you have presented, and under the premise that you will consult with a local attorney. This is not an attempt to solicit business. This disclaimer is in addition to any disclaimers that this website has made. I am only licensed in California.