Democrat Rashida Tlaib courted controversy when she used explicit language while calling for the president's impeachment.
Ms Pelosi on Thursday said while she would not use such language, it was no worse than things Mr Trump has said.
The controversy comes amid renewed talk of impeachment among lawmakers.
The Republican president called her comments "highly disrespectful" to the US in a news conference on Friday.
"I thought her comments were disgraceful. This is a person I don't know, I assume she's new," he told reporters.
"I think she dishonoured herself and dishonoured her family using language like that in front of her son and whoever else was there."
When asked about her call for impeachment, Mr Trump responded: "You can't impeach somebody that's doing a great job that's the way I view it."
Earlier on Friday, he tweeted that his political enemies only want to remove him from office because he is "the most successful".
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