哦 has different meanings depending on tone: ó (rising, surprise/realization), ò (falling, acknowledgment/understanding), and ō (flat, drawn-out acknowledgment). In texting, a flat 哦 can sound cold or dismissive.
mistakes
In text messages, replying with just 哦 is often perceived as cold or uninterested. Adding 哦哦 or 好的 sounds warmer.
