Prohibition of propaganda is aimed at preventing the formation of a positive image of all this non-Aryan dirt in the heads of children. A parade where people glorify unter... the non-Aryans is not good.
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Healthy reasoning, but agree, the “brown-eyed pride parade” is a strange idea. Like "the pride parade of fat lovers", if you stay within the discussion of sexual preferences. Especially in the assumption that it is something innate (and it is not, strictly speaking). What to be proud? Let’s look to the truth: Gay parades are not about orientation, they are about exhibitionism and indulgence.

Guys who conduct and participate in these events do not need the protection of the right to sleep with those with whom they want (to do this do not need parades, for this you need to promote the public consciousness of the idea of the inadmissibility of squeezing the nose in someone else's bed), they need, first, to exhibit their sexual life in front of people to whom it is not of interest at all, and, secondly, to get from outsiders confirmation that their preferences are not perversion. This is a kind of cry: "People! I’m not sure I’m normal, please tell me I’m good!" Of course, the answer won’t be the one they expect.