It's like this, old friend. Ellen is content to have "come out" during an era where mainstream gays are coddled by the mainstream liberal establishment, and where prejudicial attitudes towards gays (and blacks) is considered a conservative attitude, but no longer a mainstream attitude. She doesn't know what it's like to be a gay celebrity during the 1950s. She is just thankful that she doesn't happen to be a member of a minority group with whom prejudicial attitudes towards them are currently mainstream attitudes, instead of just conservative attitudes. Hence, she feels free to adopt those prejudicial attitudes towards the more despised minority group herself, and to forget where her particular minority group used to be. Remember the metaphorical tale about the black man who successfully leaves the ghetto behind, and then develops the same type of contemptuous attitude towards the people he used to share a community with as those who had always had a more privileged position in society? That metaphor applies to Ellen as much as it did to that hypothetical black man.
Also, the more mainstream gays and lesbians publicly display prejudice and antipathy towards the mere suggestion of intergenerational attraction--even when that attraction is a mere 6 years--the more they come off as distancing themselves from a currently more vilified minority group, which they see as being politically advantageous to them. People from the gay and lesbian community know how to play politics to their advantage as well as any straight person does. And despite the paucity of years between Shialene and Greyson, Ellen is using the "logic" of casting aspersions on her seeming admiration for him on the basis that she is over the Magic Age, whereas he is under it, even if just a few years of time is between them. Remember, people in our society are conditioned to see that synthetic boundary line of "18" as akin to something that is decreed by the natural forces of the universe due to its all-important legal significance to those of us who live in contemporary society.