A statutorily-enabled lawsuit on SLAPP or any other grounds will not be found to itself constitute actionable retaliation. Everyone, individuals and business entities, is entitled to exercise their statutory rights to legal process.
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Your question is unclear and more information is needed.
Whether by "SLAPP suit" you mean a lawsuit brought with the intention of discouraging protected speech, etc., or a special motion to strike in defense of such a lawsuit (i.e., an "antiSLAPP motion"), neither would by itself amount to a civil rights violation because of something called the "litigation privilege" and for other reasons.
By the way, in California we generally look primarily at the Fair Employment and Housing Act (FEHA) to remedy civil rights claims in employment rather than the federal Title VII because the FEHA tends to have broader protections.
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