Many people don't mind others using new Japanese words
On March 2021, the Agency for Cultural Affairs has conducted a survey about new Japanese words with the participant of 3794 who is above 16 years old.
They first ask how they feel about the word 「めっちゃ（meccha）」which means “very”. The 81% of the respondant answer that they don’t mind people using the word. The second word they ask is 「そっこう（sokkou）」which means “immediately”, for example, 「そっこう帰る（：go back to home immediately）」, and more than 60% of them don't mind people using it either. Also, 60% of them don’t mind people using a word,「じみに（：jimini）」which means “slightly”, for example,「じみにいたい（：it is painful just a little bit）」.
According to the survey, many people are fine with people using those three words above.
However, regarding a word 「おに（：ohni）」, which is used as “very”, for example, 「おにかわいい（：very cute）」, only 26% of the respondent answer that they don’t mind people using the word.
The Agency said “it is important to use these new Japanese words considering if the occasion is appropriate and if a person you’re talking to is older than you or not”.
Citation: NHK News