ITT: people not knowing the difference between allophone and homophone.

I don't think that it's the case here. It's simply that OP's meme leaves a lot of stuff up to context, and people are filling the gaps with assumptions. We [people in general] shouldn't assume ignorance out of simple miscommunication.

In case someone here does not know the difference:

• Allophones - sounds associated with the same phoneme in a certain language. For example, in English [pʰ] (as in "pit") and [p] (as in "spit") are allophones, as they convey the same phoneme /p/.
• Homophones - different words that sound the same. For example, in English "two" and "too" are homophones for most speakers, as they're typically pronounced [tʰu̟ː] and parsed as /tuː/.