Dancing With the Stars‘ Jen Affleck reacted to “slander” of her partner Jan Ravnik, a dancer on Taylor Swift’s Eras Tour, after criticism from former pros Maksim Chmerkovskiy and Peta Murgatroyd. Jen Affleck is giving low scores to loud critics. After former Dancing With the Stars pros Maksim Chmerkovskiy and Peta Murgatroyd criticized Jan Ravnik’s casting…