Agreed, if you talk to members of a random sect then other sects range from explicitly heretical* to simply historically‡ or structurally wrong. And that's not including the political views of various sects§.

*: Mormons & Jehovah's Witnesses from the perspective of sects that follow the Niecene creed

‡: United Methodists from the perspective of Free Methodists

§: Unitarian Universalists are left-aligned, the Southern Baptist Convention is right-aligned