Trump does not support any part of the LGBT community. You might be able to find some comments here and there about how he supports the LGBT community, but actions speak louder than words. At every chance he had, he did what he could to strip rights away from the LGBT community. They spent years ignoring Pride Month. As soon as the former president was sworn in, LGBT resource pages on the White House website were removed. They tried to remove LGBT questions from the census in order to erase LGBT people. They tried to remove LGBT people from the equal employment policies at the commerce department. They banned trans people from the military for no reason other than to be anti-LGBT. They ordered the Department of Education to remove anti-discrimination policies relating to LGBT people. They explicitly said they'd reject civil rights complaints at the Department of Education relating to LGBT issues. They gave federal funds to private schools that explicitly discriminate against LGBT people. They removed healthcare protections for LGBT people, effectively making it so anyone could refuse health care to anybody who is LGBT, for any reason. They established an office within HHS to specifically defend people who refused medical care to LGBT people. They granted federal funds to foster programs that discriminated against LGBT people. They engaged in an outright effort to specifically erase trans people from all existing protections and acknowledgements online. They ordered the CDC to stop using words like "transgender." They created a rule to stop doing data collection on LGBT foster youth, creating significant impediments to helping them, all for no reason but to cause harm. They ordered the removal of questions relating to LGBT people from forms belonging to programs that help the elderly and disabled, hindering the ability to help those people's specific needs as well. They ordered the removal of anti-discrimination policies relating to LGBT people from HUD. They ordered HUD to permit shelters to deny entry to trans people. They ordered the cancellation of HUD surveys relating to LGBT needs. They ordered the Justice Department to argue in court against anti-LGBT discrimination. They rolled back previously existing protections for LGBT people in prisons. They rolled back anti-discrimination policies affecting LGBT federal contractors. They ordered the denial of visas to same-sex partners of diplomats. They ordered a rule change so that a child born of a same-sex couple born overseas via a surrogate wouldn't be eligible for US citizenship. They removed the US from the UN Human Rights Council with one of the main reasons being because of LGBT issues (they were friendly to LGBT people and LGBT issues). They refused to sign a statement condemning physical attacks against LGBT people overseas. They ordered the removal of a pro-LGBT program in the 4H program, hurting LGBT children. They've nominated numerous justices, including ones even controversial among the Republican Party, who are vehemently anti-LGBT. Under their policies, ICE as specifically mistreated LGBT inmates in their custody. They did and said nothing relating to anti-trans violence and murders in this country.
I try to remember that the amount of ignorance needed to make a statement like "the former president was actually pro-gay" comes from a place of privilege, not a place of malice, but it was incredibly offensive.