The myth that an external force can drive otherwise-sane people to suicide merely by disapproving of some of their behaviors needs to go.
It is, ironically, perpetuated to shame and humiliate political opponents, by insidiously attempting to saddle them with responsibility for the deaths of the depressed and mentally ill.
Healthy people do not commit suicide, and they certainly don't over issues as ethereal and inconsequential as some religion's disapproval. Just having any religion automatically makes you the target of more condemnation than not, because most religions reserve eternal bliss for their own members.
Furthermore, almost every religion preaches against theft, dishonesty, duplicity, extramarital sexual conduct of any kind, and a range of other basic moral violations that are consistently verboten throughout the history of the human family. People violate these things routinely and, despite the frequent imperatives issued and social pressures imposed to encourage compliance, somehow refrain from killing themselves.
If the argument is that it's about the typical human response to homosexual conduct being so negative that it drives people over the edge, I don't see how the Mormon church, or most other Christian churches, could have any culpability for that, since a universal Christian theme is redemption, forgiveness, and an ability to leave behind a past life of sin and error whenever one commits themselves to doing so.
Mormonism in particular, as described in the parent comment, makes an effort to be civil and polite, and to encourage families to fellowship and associate with their children and friends regardless of one's level of agreement with their personal choices, including their sexual choices.
That doesn't mean that one must endorse, accept, witness, or accommodate any and all behaviors, but it means that one should remain respectful and polite, treat others with dignity and decorum, and continue to have contact in a positive manner to the fullest extent possible.
The Church is compassionate and welcoming to sinners [read: humans] of all types. No special scrutiny or shame is applied to persons who are inclined to sin by engaging in homosexual behaviors vs. those are inclined to sin differently. Any type of sexual misconduct, heterosexual or homosexual, is forbidden by the Church and regularly preached against, and I guarantee you there are many more adulterous husbands feeling guilt and shame over the much-more-frequently discussed topic of marital fidelity than there are homosexuals feeling shame on the rather rare occasion that homosexuality is broached.