Got a good laugh out of the meme, well done. I haven’t yet come across a hard G in integer… inte-gur? That sounds odd to me as well, yeah.
I’m not a linguist and only poorly speak a bit of Spanish, so I don’t have a very valid take of my own as a native speaker. But from what I’ve heard from others English is rather hard to learn as it doesn’t actually follow it’s own rules. Most of the rules it makes it breaks nearly just as often, and we colloquially use opposite words to mean the same thing sometimes. “I’m (up/down) for that from here on (in/out).” Any combination of totally opposite words in this context mean the same thing; implied agreement. Usually opposite words mean opposite things by definition, but not for us (native English speakers), and then only sometimes in context! Very exciting. (American) English just runs on vibes it seems as often as it does any real logic, which can be difficult to teach and to understand, again this is second-hand information for me but I’ve heard it from more than one person. If one already has a Germanic base like Dutch or of course German I’d imagine the learning curve is much more gentle, but for Romance languages, Asian languages, Arabic, or Afroasiatic languages it’s a rather different beast to tackle.
I’ve also heard Icelandic as the ‘consensus’ most difficult language to learn, which is why it’s a dying language and most people in Iceland just speak English, even to each other.