Yes it is the position of Ahlussunnah to refrain from cursing Yazid but their abstention is because Yazid was not directly involved in the killing of Sayyiduna Hussain رضی الله عنه and showed displeasure with the act of his governor Ubaidullah ibn Ziyad although he did not punish him either.
That is why many Sunni scholars abstain from cursing him but please do not portray it as the absolute position of ahlussunah as many great scholars of the past have cursed Yazid in their books (please refer to the book linked above - page 88 and 128 onwards) and those who have not, have definitely considered it permissible to curse ibn Ziyad, Shimr and others who actively took part in killing Sayyiduna Hussain رضی الله عنه and other members of ahlul bayt RA.
This cannot be undone and I am sure it will be greatly appreciated.
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