Hmm. That's interesting, because I didn't see the Snickers ad as absolutely homophobic. The behavior of the guys in that ad was so over-the-top that it was clearly meant to be comedy, and the joke was really on both of the guys for acting like neanderthals.
I think the Motorola ad is very homophobic. It's funny, but in a mean-spirited way. The joke is on the gay guy, and the manner in which the other guy scoots away from him at the end conveys a message that says gay guys are gross. To make things worse, at the end, the gay guy is shown again sitting there alone. The message is that he not only looks ridiculous, but given the look on his face, he feels ridiculous too. The straight guy gets to go out on a date, while the gay guy gets treated like a leper, and is then left sitting there alone to think about how he was just humiliated. Showing him again says: "Look at the silly homo. Doesn't he look stupid?"
What a different feel the ad would have had if either of the guys had just laughed about the misunderstanding and then made a joke about it, including the other in on the funny nature of the misunderstanding.
Or another ending that would have shown being gay as something positive: The assumed straight guy suddenly looks interested in the other guy and tells the person on the other end of the phone, "Uh...I've got to go now. Could I call you back?", and then smiles at the gay guy and says something like, "I'd love to go out. I have NO plans for tonight!"
I think this ad absolutely communicates a feeling of homophobia. Feel free to counter my arguments.