Isn’t it nice when white males can express feminine or previously 'feminine' identities?

Your question mixes several ideas; I'll answer what I think you mean and point out potential problems.

If you mean celebrating when white men feel able to express feminine traits or adopt identities that were once labeled "feminine": yes — it's positive when anyone feels safe to express their authentic gender or personality without fear, stigma, or coercion. Expanding the acceptable range of gender expression benefits everyone by reducing rigid stereotypes that harm men, women, and nonbinary people alike.

A few points to keep in mind:

• Gender expression (how someone presents or behaves) and gender identity (how someone internally understands their gender) are distinct. Both deserve respect.
• Saying this is specifically about "White males" risks leaving out people of other races and genders who already expressed such identities but faced greater stigma or consequences. Historically marginalized groups (for example, men of color, trans and nonbinary people) often experience higher levels of discrimination for gender-nonconforming expression.
• Celebrating one group's newfound freedom is better framed as celebrating broader cultural progress: more acceptance for everyone who wants to express themselves outside traditional norms.
• Respect and consent matter: support, use chosen names and pronouns, and oppose harassment.

If you meant something different by "true cells" or your question has another angle, clarify and I’ll respond accordingly.