"Mężczyzna lubi wino."

Translation: The man likes wine.

[Rewm]

Do I really hear N instead of M at the beginning?

[vytah]

The audio sounds fine.

[nidominika]

ye it sounds like that but it shouldn't; it's still M

[PowerJustice]

How do you say "don't like" sth.?

[Jellei]

You put "nie" before the verb, and the object takes Genitive instead of Accusative. "Mężczyzna nie lubi wina".

Only Accusative changes the case when negated, other cases stay unchanged.

[WadeDavis]

I am assuming wino has no accusative ending, so it's just "wino" not "winę"?

[Jellei]

"wino" is neuter, so its Accusative is identical to Nominative.

"winę" is Accusative of "wina", which is "guilt".

"wina" is also Nominative plural and Accusative plural "wines", but that's aside.