No, that would probably irritate people, which is why people are gnashing their teeth at the thought of Whatsapp having ads. Having companies invade private conversations isn't just creepy, it's infuriating.
Your analogy doesn't fit to twitter though because this guy isn't having a private conversation; he's broadcasting his opinions publicly to the world. Imagine someone with a megaphone in an outdoor mall shouting about how shitty a company is. People would probably love the idea of a rival from another company engaging with that guy and saying "yeah, they suck, that's why I started this company, check us out." I doubt many people would find it creepy.
Your analogy doesn't fit to twitter though because this guy isn't having a private conversation; he's broadcasting his opinions publicly to the world. Imagine someone with a megaphone in an outdoor mall shouting about how shitty a company is. People would probably love the idea of a rival from another company engaging with that guy and saying "yeah, they suck, that's why I started this company, check us out." I doubt many people would find it creepy.