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What if my "issues" included my girlfriend having had sex with a black guy? (I'm white.) Or a Hispanic? What if they included having sex with the lights on, instead of in the dark? What if they included talking during sex, or any position other than the missionary?
You imply that we all have our boundaries and nobody should be criticized for where they choose to draw the line. But many of us who think the LW is a jerk disagree with that, because there are certianly places to draw the line that are more respectful, fairminded and sex-positive than others. Just as we would comfortably say that those who endorse sex with small children are way off base, if you or the LW think that any and all threesomes are somewhere near fucking a horse on the spectrum of acceptability, then you're entitled to your opinion, but there are others of us who are fairly going to call that unhealthy.