Realmente no tengo una opinión respecto a ello.

Translation: I really don’t have an opinion about it.

Notes from spanishdict about the difference between respecto and respeto.

Respecto — has to do with how something relates to another. For example, “con respecto a su pregunta…” → “With respect to your question…/In regards to your question…”

Respeto — Deals with consideration or deference that one gives to another. For example “Es una falta de respeto que me lo preguntes” → “It’s disrespectful for you to ask me that.”