I guarantee a reply to any new conversation.
What you call basic principles are actually subjective value judgments, or in the case of using mentally retarded people as models for animal intelligence, complete bullshit.
Your argument is constructed as follows:
Basal assumption: all Humans are valuable. [we both agree]
Basal assumption: Animals are like a subset of humans. [categorically wrong]
Basal assumption: 'Like' only guarantees animals to cherry picked human rights. [non sequitur]
Conclusion: Eating animals is okay but having sex with them is not. [non sequitur]
I am proposing this alternative:
Basal assumption: Humans, in general, are valuable. [we both agree]
Fact: Disease, in general, harms humans. [proven]
Fact: Sex with animals is a significant disease risk [proven]
Caveat: Eating animals is not a significant disease risk [proven]
Conclusion: Eating animals is permitted, having sex with them should not be. [sequitur]