To be honest, I like the weird mixing of metaphor and literalness, it's quirky and weird and kind of interesting. Thanos loves Death because on some level he is suicidial (and intends to take people down with him as well) but Death is also a person that he loves. Is it incoherent? Hell yes, but it's interesting and quirky and weird in a way that I like.

It's like an Ikuhara anime, where bears are lesbians but also literally bears.