According importance to subtextual cues for queer ships is not delusional. When you’re attracted to people of the same sex and/or gender, you learn to look for those. To look for “clues” telling you about the person’s orientation and possible attraction to you. If you hear them saying they are “not gay” to someone, you don’t assume they’re straight. You analyse how they interact with you to know if they are flirting or not. You pay attention to how uncomfortable they are if touching you and so on. That’s why when John asks Sherlock if he has a boyfriend, licks his lips, tells him it’s good that he’s unattached like him, or when Sherlock says goodbye to John, offers his hand and it takes a long time for John to shake it, we don’t “read too much into things”. We just observe.