I just find it ridiculous. Mainly for the fact that even for Dalai Lama, when he gives teachings, he welcomes all to join in and listen in his teachings. But before he gives tantric teachings, he would request Dorje Shugden practitioners to leave as a respect towards him.
If these monks and temples really want to show Dalai Lama that they respect him, they should be doing the same. Welcoming them in with both hands, but kindly and nicely asking them to leave when it comes to tantric related teachings. But there is no harm for people to learn and get blessed. That is then what true Buddhism is about. Having compassion, being kind, and love all sentient beings.